The Ruin of Souls — Thomas Laird

THE RUIN OF SOULS is a post-World War II thriller that centers around an ex-SS captain, Eric Daemon, who escapes Nazi Germany at the end of the war and who is captured by the OSS in South America. Daemon is recruited to spy on East and West Germany during the Cold War, he finds himself in Chicago as part of a deal for his help in Europe. But when Daemon sets up his new residence, a survivor of the Holocaust, and the camp where the German officer did his evil, spots the SS captain on the streets of Chicago. Daemon murders the survivor, and Detective Jake Parisi of Chicago Homicide begins pursuit of the Nazi war criminal. 

Parisi runs into roadblocks from the FBI, the CIA, and the Mossad in his pursuit of Eric Daemon. Dead end after dead end begins to wear on Jake, but he will not let this monster get away. A relentless search for the Nazi results in a heart pounding conclusion.